What was your most embarrassing or funny sexual experience?

A friend of a woman I was living with many years ago was visiting us for a weekend. My girlfriend of the time loved taking nude and masturbatory photos of me and showing them to her girlfriends. She showed them to this particular friend who complained that she'd never seen a man masturbate and she'd asked her boyfriend to do it for her but he wouldn't. So I got volunteered to recreate the photos live for our visitor. To make things a bit hornier we were both naked and I was laying back between her legs and she was watching over my shoulder as I masturbated for her. Things went as planned pretty much, except I guess I got a bit more excited than either of us expected and when I came I didn't just come onto my stomach but shot off with extra strength right over my stomach, chest and shoulder and just missed hitting my audience in one eye.